Well thats the error i've been getting once i click the;
Firefox 1.0.2.dmg.download file.
The download.mozilla.org file opens Excel so i don't know whats going on.
Any help would be highly appreciated.
lol. You're not going to like my answer.... download it again. The dmg file is corrupted. Try it again. If the new dmg mounts, you can then drag the FireFox app to your Applications folder to install it. "Eject" the FireFox virtual disk, and you're done.
The downloaded file could be corrupted, but in my experience, a downloaded file that ends with a .download extension is NOT a complete download. For some reason, it did not finish downloading. When the download is complete, the .download extension will vanish.
Download again.
